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Shi Y, Wang Y, Huang Z, Zhang F, Shao Y. t BuOLi-Promoted Hydroboration of Esters and Epoxides. ACS OMEGA 2022; 7:18876-18886. [PMID: 35694491 PMCID: PMC9178618 DOI: 10.1021/acsomega.2c01866] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Commercially available and inexpensive lithium tert-butoxide ( t BuOLi) acts as a good precatalyst for the hydroboration of esters, lactones, and epoxides using pinacolborane as a borylation agent. Functional groups such as cyano-, nitro-, amino-, vinyl, and alkynyl are unaffected under the presented hydroboration process, representing high chemoselectivity. This transformation has also been effectively applied to the synthesis of key intermediates of Erlotinib and Cinacalcet. Preliminary investigations of the mechanism show that the hydroboration proceeds through the in situ formed BH3 species.
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Affiliation(s)
- Yinyin Shi
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yue Wang
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Zhefan Huang
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Fangjun Zhang
- School
of Pharmaceutical Sciences, Wenzhou Medical
University, Wenzhou 325035, China
| | - Yinlin Shao
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
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Wang Y, Xu X, Wu G, Pang B, Liao S, Ji Y. Ligand-Enabled C-H Olefination and Lactonization of Benzoic Acids and Phenylacetic Acids via Palladium Catalyst. Org Lett 2022; 24:821-825. [PMID: 35025521 DOI: 10.1021/acs.orglett.1c04000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A novel ligand propan-2-one O-(p-tolylcarbamoyl) oxime (L7) has been developed to promote C(sp2)-H olefination of benzoic acids and phenylacetic acids via a palladium catalyst. With the subsequent lactonization of the olefinated products through 1,4-addition, highly monoselective cyclic lactone products of benzofuranones and benzopyrones were obtained in moderate to excellent yields. The DFT calculation demonstrated that the novel ligand propan-2-one O-(p-tolylcarbamoyl) oxime (L7) could improve the C-H activation reaction to give cyclic lactone products elegantly.
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Affiliation(s)
- Yangyang Wang
- Engineering Research Centre of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Xiaobo Xu
- Engineering Research Centre of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Gaorong Wu
- Engineering Research Centre of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Binghan Pang
- Engineering Research Centre of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Shaowen Liao
- Shanghai Jinli Pharmaceutical Co. Ltd., 108 Yuegong Road, Shanghai 201507, P. R. China
| | - Yafei Ji
- Engineering Research Centre of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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Sun F, Feng H, Huang L, Liu W. Lewis Acid‐Free Ynoate‐Mediated Chemoselective Reduction of Carboxylic Acids to Primary Alcohols. ChemistrySelect 2020. [DOI: 10.1002/slct.202002728] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Feixiang Sun
- College of Chemistry and Chemical EngineeringShanghai University of Engineering Science Shanghai 201620 China
| | - Huangdi Feng
- College of Chemistry and Chemical EngineeringShanghai University of Engineering Science Shanghai 201620 China
| | - Liliang Huang
- College of Chemistry and Chemical EngineeringShanghai University of Engineering Science Shanghai 201620 China
| | - Weiping Liu
- College of ChemistryChemical Engineering and Biotechnology, Donghua University Shanghai 201620 China
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Yu Z, Xu F, Li Y, Konno H, Li H, Yang S. Tetraethylammonium Fluoride-mediated A Green Hydrogen Transfer Process for Selective Reduction of Biomass-derived Aldehydes. CURRENT GREEN CHEMISTRY 2019. [DOI: 10.2174/2213346106666190830115519] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hydrogenation of furfural (FUR) to furfuryl alcohol (FFA) is a key step and one of the representative
examples for comprehensive utilization of biomass, while relatively harsh conditions are
typically required to achieve satisfactory results using molecular hydrogen, formic acid, or alcohol as
H-donor over expensive metal catalysts. In this work, a new and benign reaction system, composed of
green and cheap tetraethylammonium fluoride and polymethylhydrosiloxane (PMHS), is developed to
be efficient for transfer hydrogenation of bio-based FUR to high-value FFA under mild conditions.
After reacting at 35 ℃ for 0.5 h, 94.9% FUR conversion and 92.3% yield of FFA could be achieved.
This protocol is also widely applicable to the selective reduction of various aromatic aldehydes, giving
relevant alcohols in high yields of 81.0-99.9% at 35-60 °C within 30-120 min. Moreover, the mechanism
of fluoride-activated hydrosilylation was demonstrated to be responsible for the efficient transfer
hydrogenation process.
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Affiliation(s)
- Zhaozhuo Yu
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research & Development of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Fusheng Xu
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research & Development of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Yan Li
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research & Development of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Hiroyuki Konno
- Graduate School of Science and Engineering, Yamagata University, Jyonan 4-3-16, Yonezawa, 992- 8510, Japan
| | - Hu Li
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research & Development of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
| | - Song Yang
- State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for Research & Development of Fine Chemicals, Guizhou University, Guiyang, Guizhou 550025, China
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